Using a mega-regions ("geographical regions defined on the basis of economic integration and other forms of interdependence") framework to model regional consolidation of shared print book library collections, this report explores a counterfactual scenario where local US and Canadian print book library collections are consolidated into regional shared collections. The analysis in this paper builds upon findings from the OCLC Research report, Cloud-sourcing Research Collections: Managing Print in the Mass-digitized Library Environment (2011), and draws upon bibliographic and library holdings data from the WorldCat database.